Q-2 The front compound wall of a house is decorated by wooden spheres of diameter 21cm, place on small supports as shown in the figure. Eight such spheres are used for this purpose, and are to be painted silver. Each support is a cylinder of radius 1.5cm and height 7cm and is to be painted black. Find the costs if silver paint costs 25 paise per cm2 and black paint costs 5 paise per cm2.